Armanino Acquires MSTiller, a 110-Person Georgia Firm. That's 3 Deals in 2026.

Armanino just added a 110-person Georgia firm — and it is the third M&A deal this year for the top 20 firm.

MSTiller, founded in 1956 with offices in Atlanta, Brunswick, Duluth (Georgia), and White Plains (New York), joined Armanino on March 2. Financial terms were not disclosed, but the deal expands Armanino's presence in what CEO Matt Armanino called one of the fastest-growing regions of the U.S.

The Deal

MSTiller brings about 110 professionals specializing in tax, audit, and advisory services for middle-market companies, family-owned businesses, and private foundations. Both firms are members of the Moore Global network, and Armanino says they have worked alongside each other for decades through that relationship.

This is Armanino's third acquisition of 2026. The firm also added Sales Tax Defense and Step Up Consulting in January.

What MST Clients Get

With the deal, MSTiller clients gain access to Armanino's national platform, including: Advanced technology consulting, SALT planning, International tax and transfer pricing, Valuations and transaction advisory, and Tax credits and incentives.

Angela Griner, managing partner of MSTiller, said the decision came down to culture and capability. Armanino stood out because of its culture, foresight, and a trusted relationship built over decades. Their commitment to technology, AI, and modern service delivery gave us confidence that we can better serve increasingly complex client needs.

What This Means for Accounting M&A

Armanino is backed by Further Global Capital Management, a New York-based PE firm that took a minority stake in October 2024. That investment supports expansion into new markets and technology infrastructure improvements.

Three acquisitions in two months signals aggressive growth. The focus on the Southeast — where Georgia, Florida, and the Carolinas are seeing massive population and business migration — makes strategic sense. If you are a mid-sized firm in the Southeast, expect more consolidation. National firms with PE backing are shopping.

Bottom Line

Armanino added 110 professionals and four offices across Georgia and New York. MSTiller's 68-year reputation in the Southeast gives Armanino immediate credibility in a high-growth market. For CPAs watching the M&A market, it is another data point: firms with PE backing are accelerating expansion, and the Southeast is the target.